In other instances it is possible to monitor indicators such as the amount of forest cover (using remote sensing and GIS systems) and infer from species/area relationships what the status of a particular forest species might be. While there is a bit of debate whether species-area relationships have been used in ways that can overestimate, there is no debate about the species-area relationship itself. And clearly when extinction is the matter of concern any overestimation problem vanishes as habitat shrinks to single digit percentages.
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